[leftcoastman]

It's always a balancing act. If you overcool the brakes on the street, that could also cause problems. Excessive heating and cooling cycles will result in cracked rotors. Been there, done that.

Keep in mind that Porsches don't weigh what our cars weigh and in the case of the Cayman, Cayman S and 911 (non-S, non turbo), don't generate the same speed on the straights.

I've been around racing long enough that just about everyone accepts that you have to rebuild calipers if you're tracking the car. Do a google search on "brake dust boot track use".

I may develop direct cooling ducts for track use. I'll block em off for street use. Next time you're around an e9x M3, take a look inside the front wheel well. You'll notice something is missing: any brake ducts at all.